Truck for railway rolling stock



Aug. 10 1926. 1,595,587

A. J. TOWNSEND E-r AL TRUCK FOR RAILWAY ROLLING STOCK Original Filed y 10. 1921 3 Sheets-She't 1 z 25 5 gvEA/mlas By Al fl gww lei W 5 "ZTTORNEYQ;

Original Filed y 10 1921 3 Sheets-Sheet 3 INVENTORS 7M BY M ATTORNEY A J TOWNSEND ETAL TRUCIfK FOR RAILWAY ROLLING STOCK Aug. 10 1926.

mmfss' flaw/ W Patented Aug.10, 1926.

UNITED STATES PATENT orrics. v

ALBERT J'. TO'W'NSEND AND HERBERT W. SNYDER, OF LIMA, OHIO.

TRUCK non RAILWAY BGLLING s'rooK.

Original application filed May 10, 1921, Serial No. 468,380. Divided and this application filed October 9,

This invention relates to trucks for railway rolling stock and is a division of our application Serial No. 468,380, filed May 10th, 1921.

One of the primary objects of our invention is the provision of an improved arrangement of swing or lateral motion truck in which undue strain on a distortion of parts during the lateral motion are prevented.

Another object of our invention is the provision of an improved centering mechanism for trucks of the swing or lateral motion type. v

A further object-of our invention is to provide an improved rocker bearing which will offer approximately constant resistance throughout the range of movement of the truck. V

We propose to obtain the ob ects and advantages above set forth and such others as may hereinafter appear or are incident to our invention by means of a construction, the preferred embodiments of which are illustrated in the accompanying drawings, wherein- Fig. 1 is a plan View of a truck embodying our invention, the top half of the figure showing the main locomotive frame and the lower half showing those portions of the truck below the main frame; Fig. 2 is a side elevation of the truck shown in Fig. 1; Fig. 3 is a view showing an end elevation of the truck on the right hand and a section through the bolster on the left hand; Figs. t and 5 are sectional views showing the construction and illustrating the operation of the lateral resistance rockers; and Fig. 6 is a diagram further illustrating the operation of the rockers.

Referring nOW to Figs. 1, 2 and 3, it will be seen that we have illustrated our invention as applied to a locomotive trailing truck of the two wheel type. The truck frame is pivoted on the main frame D of the locomotive at the forward end of the truck frame as indicated at E. The weight on the truck springs F and the locomotive springs G is equalized by the equalizing beam 7 provided with the usual hangers 8, the rear ends of the truck springs being connected to the truck bolster H by hangers 9, which serve to support the bolster. From inspection of Figs. 2 and 3, it will be seen that the bolster is supported against all but Serial No. 742,517.

vertical movement relative to the truck frame.

The equalizing beam fulcrums I are floating and are preferably integral with or rigidly secured to a T shaped guide frame 10 pivoted at the forward end to the same pin as the truck frame A. The pads 11 on the cross frame 11 secured to the main locomotive frame rest on the upper surface of the guide frame 10.

It will be seen that the truck frame is free to rock up and down with respect to the guide frame 10 but on lateral motion of the truck frame A it comes into engage ment with one or the other of the fulcrums and thereafter the truck frame A and guide frame 10 and fulcrums rotate together about the pivot pin as an axis. During lateral motion the guide frame 10 slides along the abutting surfaces of the pads 11.

Referring now to the truck centering device, this is contained in the bolster H extending across the rear of the truck, which, as before pointed out, is supported within the truck frame by the hangers 9 and guided or sustained therein against all butrelative vertical movement. This bolster carries the centering rockers J, which are preferably set tangent to a circle struck from the truck frame pivot as a center in order to function more freely and accurately during lateral motion of the truck. The rockers, of course, in turn support the load imposed upon them by the frame of the locomotive as will be clear on inspection of Fig. 8.

Each rocker is provided with two journals 12 for which suitable s ats are provided in the engine frame D. The cam surfaces of the rockers bearing on the flat surface of the bolster have approximately the outline of an involute of a circle whose diameter is equal to the distance between the centers of the rocker journals, the involute outline beginning at the center line of the rocker and extending to both sides from the center line in such manner that the face of the rocker is practically symmetrical. The

rockers work between the inclined guide members 13. The are also to some extent,

positioned and guided by the pins 14 workface remains very nearly in the same vertical plane relative to the journal bearings for all positions or" the rocker.

The operation is as follows: one half of the Weight carried by the truck is transmitted through the rockers and bolsters to the spring. When the truck is in a central position', the rockers are vertical and the Weight is borne on all rocker journals. As soon as the truck begins to swing laterally the roclrers'rota'te and the weight is carried by the journal about Which the rocker is rotating, and the horizontal' component of the line of force due to the load is transmitted through the bolster to the truck frame and offers the necessary lateral resistance of the truck to keep the locomotive in a stable.

condition. The lines of force and the operation of the rocker w1ll be rendered clearly understandable by the additional diagram,

Fig. 6; from inspection of which it will be seen that since the angle of inclination of the line'of force is nearly constant, becoming but slightly less as the truck swings out, the horizontal component and consequently the lateral resistance are "nearly constant, the amount of resistance slightly decreasing as the truck swings out, making the operation of the truck perfectly safe over its entire range of motion.

lVhat We claim is 1. In a truck, a lateral motion resistance rocker having a jo'urnaland a cam surface approximately in the shape of an involute of a circle.

2. In a truck, a lateral motion resistance rocker having-a pair of journals and a pair of cam surfaces each approximately inthe shape of an involute of a circle Whose diameter is equal to the distance between the centers of the journals.

3. In a truck, a lateral motion resistance rocker having journals and cam surfaces approximately in the shape of an involute of a circle.

In testimony whereof, We have hereunto signed our names.

ALBERT J. TOWNSEND. HERBERT W. SNYDER. 

